WATCH: Nelly Sweats and Flexes His Bulging Biceps

Ab and pectastic rapping hotness Nelly works up a sweat as flexes and trains his bulging ... umm, biceps.

The rapper slash underwear model—last seen iPhoning his swagger and  swinging a big ole bat—is joined by celebrity fitness trainer Donta who is hard and bulging all over. More screen caps and watch the video WHEN YOU JUMP ...